Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS20040012971 A1
Publication typeApplication
Application numberUS 10/263,549
Publication dateJan 22, 2004
Filing dateOct 4, 2002
Priority dateJul 22, 2002
Also published asUS6722773
Publication number10263549, 263549, US 2004/0012971 A1, US 2004/012971 A1, US 20040012971 A1, US 20040012971A1, US 2004012971 A1, US 2004012971A1, US-A1-20040012971, US-A1-2004012971, US2004/0012971A1, US2004/012971A1, US20040012971 A1, US20040012971A1, US2004012971 A1, US2004012971A1
InventorsYi Tsai, Hung Lee, Chou Kang, Han Lin
Original AssigneeChi Mei Optoelectronics Corp.
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Illuminating device and tube-like lamp thereof
US 20040012971 A1
Abstract
An illuminating device mainly includes a tube-like lamp disposed in a main body. The tube-like lamp has two terminal portions adapted for electrically connecting to a power source and a bending portion between the terminal portions. The main body is provided with a support having two hooked portions configured to support the tube-like lamp. The present invention further provides another tube-like lamp characterized by having a buffer part securely attached on the bending portion for lessening or absorbing the shock of an impact on the tube-like lamp. The support may has a gap between the hooked portions such that the tube-like lamp fit with sufficient tightness into the gap between the hooked portions thereby immobilizing the tube-like lamp more efficiently and absorbing the shock.
Images(6)
Previous page
Next page
Claims(15)
What is claimed is:
1. A tube-like lamp having two terminal portions adapted for electrically connecting to a power source and a bending portion between the terminal portions, the tube-like lamp comprising a buffer part securely attached on the bending portion for lessening or absorbing the shock of an impact on the tube-like lamp.
2. The tube-like lamp as claimed in claim 1, wherein the buffer part is an O-ring.
3. The tube-like lamp as claimed in claim 1, wherein the buffer part is a C-shaped ring.
4. An illuminating device comprising:
a lamp having two terminal portions adapted for electrically connecting to a power source and a bending portion between the terminal portions, the lamp comprising a buffer part securely attached on the bending portion; and
a main body provided with a supporting device for connecting the buffer part of the lamp thereby helping to fasten the lamp to the main body.
5. The illuminating device as claimed in claim 4, wherein the support has two hooked portions and a gap between the hooked portions, the hooked portions are configured to support the lamp, and the buffer part of the lamp fits into the gap between the hooked portions.
6. The illuminating device as claimed in claim 4, wherein the buffer part is an O-ring.
7. The illuminating device as claimed in claim 4, wherein the buffer part is a C-shaped ring.
8. The illuminating device as claimed in claim 4, wherein the illuminating device is a backlight device for a liquid crystal display.
9. The illuminating device as claimed in claim 4, wherein the main body comprises:
a housing;
a reflector interposed between the lamp and the housing; and
a diffusion plate,
wherein the reflector reflects light radiated from the lamp toward the diffusion plate.
10. The illuminating device as claimed in claim 4, wherein the main body comprises:
a housing including a base and a case body;
a reflector interposed between the lamp and the base of the housing; and
a diffusion plate sealing the top of the case body of the housing,
wherein the terminal portions of the lamp are disposed along one side of the base.
11. An illuminating device comprising:
a first lamp having two terminal portions adapted for electrically connecting to a power source and a bending portion between the terminal portions; and
a main body provided with a first supporting device, the first supporting device having two hooked portions configured to support the first lamp thereby helping to fasten the lamp to the main body.
12. The illuminating device as claimed in claim 11, further comprising:
a second lamp having two terminal portions adapted for electrically connecting to a power source and a bending portion between the terminal portions;
a second supporting device disposed on the main body, the second supporting device having two hooked portions configured to support the second lamp; and
a third supporting device disposed on the main body and disposed between the first lamp and the second lamp, the third supporting device having two hooked portions configured to support the first lamp and the second lamp.
13. The illuminating device as claimed in claim 11, wherein the illuminating device is a backlight device for a liquid crystal display.
14. The illuminating device as claimed in claim 11, wherein the main body comprises:
a housing;
a reflector interposed between the lamp and the housing; and
a diffusion plate,
wherein the reflector reflects light radiated from the lamp toward the diffusion plate.
15. The illuminating device as claimed in claim 11, wherein the main body comprises:
a housing including a base and a case body mounted on the base;
a reflector interposed between the lamp and the base of the housing; and
a diffusion plate sealing the top of the case body of the housing,
wherein the terminal portions of the lamp are disposed along one side of the base.
Description
    BACKGROUND OF THE INVENTION
  • [0001]
    1. Field of the Invention
  • [0002]
    The present invention relates to an illuminating device and a tube-like lamp thereof, and more specifically relates to a backlight device for a liquid crystal display.
  • [0003]
    2. Description of the Related Art
  • [0004]
    Generally, a liquid crystal display includes a liquid crystal panel which has two substrates and a liquid crystal interposed therebetween, and an illuminating device such as a backlight unit which is disposed behind the liquid crystal panel. The backlight unit is configured to distribute a light from a light source uniformly over the surface of the liquid crystal panel. Currently, there are a few kinds of backlight units such as direct and edge light types.
  • [0005]
    The direct type backlight device usually comprises a U shaped lamp disposed inside a housing. The U shaped lamp has two terminal portions adapted for electrically connecting to a power source. Since the terminal portions of the U shaped lamp are located on the same side, the direct type backlight device is typically provided with a fixing mechanism such as a rubber fastener for securely attaching the bending portion of the U shaped lamp to the housing. It is noted that the conventional fastener is typically configured to directly wrap around a part of the bending portion of the U shaped lamp thereby further immobilizing the lamp.
  • [0006]
    Since the rubber fastener directly wraps around the U shaped lamp, the rubber fastener facilitates the heat dissipation from the bending portion of the U shaped lamp. Therefore, when a liquid crystal display using the aformentioned backlight device is placed in a low temperature environment (such as a 0 C. chamber) for conducting a long-time operation test, the temperature of the bending portion of the U shaped lamp is at least 10 degrees Centigrade lower than that of other portions of the lamp thereby causing the phenomenon of low-temperature pink.
  • SUMMARY OF THE INVENTION
  • [0007]
    Therefore, it is an object of the present invention to provide an illuminating device characterized by utilizing a novel fixing mechanism to facilitate the immobilization of tube-like lamps provided therein which overcomes, or at least reduces the above-mentioned problems of the prior art.
  • [0008]
    According to one embodiment of the present invention, the illuminating device mainly includes a tube-like lamp disposed in a main body. The tube-like lamp has two terminal portions adapted for electrically connecting to a power source and a bending portion between the terminal portions. The tube-like lamp is characterized by having a buffer part, e.g., an O-ring or a C-shaped ring, securely attached on the bending portion for lessening or absorbing the shock of an impact on the tube-like lamp. The main body is provided with a supporting device for engaging the buffer part of the tube-like lamp thereby helping to immobilize the tube-like lamp. Specifically, the supporting device has two hooked portions and a gap between the hooked portions. The hooked portions are configured to support the tube-like lamp, and the buffer part of the tube-like lamp fits with sufficient tightness into the gap between the hooked portions thereby immobilizing the lamp efficiently. The main body typically includes a housing, a reflector interposed between the tube-like lamp and the housing, and a diffusion plate. Specifically, the housing of the main body includes a base and a case body disposed on the base. The reflector is provided between the tube-like lamp and the base of the housing. The diffusion plate seals the top of the case body of the housing. The terminal portions of the tube-like lamp are disposed along one side of the base of the housing.
  • [0009]
    The illuminating device according to another embodiment of the present invention is characterized in that the main body is provided with a first supporting device having two hooked portions configured to support a first tube-like lamp thereby helping to immobilize the first tube-like lamp. The illuminating device is preferably provided with a second tube-like lamp, a second supporting device having two hooked portions configured to support the second tube-like lamp, and a third supporting device disposed on the main body and disposed between the first tube-like lamp and the second tube-like lamp wherein the third supporting device having two hooked portions configured to support the first tube-like lamp and the second tube-like lamp. The fixing mechanism of the present invention, i.e., the supporting device, is characterized by utilizing two hooked portions to support the tube-like lamp thereby significantly reducing the heat dissipated from the contact surface between the lamp and the fixing mechanism. Therefore, the phenomenon of low-temperature pink is not observed when a liquid crystal display using the backlight device of the present invention is placed in a low temperature environment (such as a 0 C. chamber) for conducting a long-time operation test.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0010]
    Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
  • [0011]
    [0011]FIG. 1 is an exploded perspective view showing an illuminating device according to one embodiment of the present invention;
  • [0012]
    [0012]FIG. 2 is a perspective view of the tube-like lamps and the supporting devices for immobilizing the tube-like lamps of FIG. 1 on an enlarged scale;
  • [0013]
    [0013]FIG. 2a is a cross-sectional view taken along line 2 a-2 a of FIG. 2;
  • [0014]
    [0014]FIG. 2b is a cross-sectional view taken along line 2 b-2 b of FIG. 2;
  • [0015]
    [0015]FIG. 3 is an exploded perspective view showing an illuminating device according to another embodiment of the present invention;
  • [0016]
    [0016]FIG. 4a is a perspective view of one tube-like lamp of FIG. 3 on an enlarged scale;
  • [0017]
    [0017]FIG. 4b is a cross-sectional view taken along line 4 b-4 b of FIG. 4a;
  • [0018]
    [0018]FIG. 4c is a perspective view of another tube-like lamp of FIG. 3 on an enlarged scale;
  • [0019]
    [0019]FIG. 4d is a cross-sectional view taken along line 4 d-4 d of FIG. 4c;
  • [0020]
    [0020]FIG. 5a is a perspective view of the supporting devices of FIG. 3 on an enlarged scale;
  • [0021]
    [0021]FIG. 5b is a side view of a portion of the tube-like lamp of FIG. 4a engaged with the supporting device of FIG. 5a; and
  • [0022]
    [0022]FIG. 5c is a side view of a portion of the tube-like lamp of FIG. 4c engaged with the supporting device of FIG. 5a.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • [0023]
    [0023]FIG. 1 and FIG. 3 illustrate the illuminating devices according to different embodiments of the present invention, and similar components have been given the same reference numerals. These illuminating devices all have a main body comprising a housing (including a base 120 and a case body 130), a reflector 140 and a diffusion plate 142. The diffusion plate 142 seals the top of the case body 130 of the housing.
  • [0024]
    [0024]FIG. 1 shows an illuminating device 100 according to one embodiment of the present invention. The illuminating device 100 mainly includes three tube-like lamps 110 disposed in the main body. The tube-like lamp 110 has two terminal portions 112 adapted for electrically connecting to a power source (not shown) and a bending portion 114 between the terminal portions 112. The terminal portions 112 of the tube-like lamps 110 are securely attached to the base 120 of the housing. In this embodiment, the illuminating device 100 is provided with several supporting devices 150, 160 each having two hooked portions 162 (see FIG. 2a and FIG. 2b) for supporting the tube-like lamps 110, thereby helping to immobilize the tube-like lamps 110. Referring to FIG. 2, the supporting device 150 is disposed inside the tube-like lamp 110, and adjacent supporting devices 150 are arranged in a line. The supporting device 160 is disposed between two adjacent tube-like lamps 110, and adjacent supporting devices 160 are arranged in a line. The supporting device 150 is preferably at a distance (about 8 cm to about 9 cm) from the bending portion 114 of the tube-like lamp 110. The supporting device 160 is preferably at a distance (about 9 cm to about 10 cm) from the bending portion 114 of the tube-like lamp 110. Preferably, the supporting device 150 and the supporting device 160 are spaced apart from each other by a predetermined distance such as 1 cm or greater, thereby immobilizing the tube-like lamp 110 more efficiently. The supporting devices 150, 160 may have lock means 164 (see FIG. 2a and FIG. 2b) for mounting the supporting devices 150, 160 to the base 120 and the reflection plate 140. It should be understood that the reflection plate 140 is disposed between the tube-like lamp 110 and the base 140 of the housing. Therefore, upon lighting of the tube-like lamps 110 built in the display device, the light directly entering the diffusion plate 142 from the lamps 110 is mixed with the light being reflected by the reflection plate 140 and entering the diffusion plate 142 thereby forming the surface luminance of the diffusion plate 142.
  • [0025]
    [0025]FIG. 3 shows an illuminating device 200 according to another embodiment of the present invention. The illuminating device 200 is substantially identical to the illuminating device 100 of FIG. 1 except tube-like lamps 210 and supporting devices 220. The tube-like lamp 210 has two terminal portions 212 adapted for electrically connecting to a power source (not shown) and a bending portion 214 between the terminal portions 212. Referring to FIG. 4, the tube-like lamp 210 is characterized by having a buffer part, e.g., an O-ring 210 a or a C-shaped ring 210 b, securely attached on the bending portion 214 for lessening or absorbing the shock of an impact on the tube-like lamp. The supporting device 220 is configured to engage the buffer part of the tube-like lamp 210 thereby helping to immobilize the tube-like lamp. The contact area between the tube-like lamp and the supporting device can be reduced through the installation of the buffer part thereby significantly reducing the heat dissipated from the contact surface between the lamp and the fixing mechanism, i.e., the supporting device. Referring to FIG. 5, the supporting device 220 has two hooked portions 220 a and a gap 220 b between the hooked portions 220 a. Referring to FIG. 5a, the hooked portions 220 a of the supporting device 220 are configured to support the tube-like lamp 210, and the buffer part, i.e., the O-ring 210 a (see FIG. 5b) or the C-shaped ring 210 b (see FIG. 5c), of the tube-like lamp fits with sufficient tightness into the gap 220 b between the hooked portions 220 a thereby immobilizing the tube-like lamp 210 more efficiently. Referring to FIG. 3 and FIG. 5a, the supporting device 220 may have lock means 220 c for mounting the supporting device 220 to the base 120.
  • [0026]
    The tube-like lamp of the present invention may be a cold cathode fluorescent lamp (CCFL). Although the tube-like lamps 110, 210 is illustrated as U-shaped lamps in the drawings of the present invention, tube-like lamps having various shapes are still considered within the spirit and scope of the invention if the tube-like lamps have terminal portions (for electrically connecting to a power source) all located on the same side. Conceivable shapes are U, V, W, double V, triple U, since each of which may be regarded as a tube-like lamp with terminal portions (for electrically connecting to a power source) all located on the same side.
  • [0027]
    The illuminating devices of the present invention may be designed as a backlight device for a liquid crystal device. The fixing mechanism of the present invention, e.g., the supporting devices 150, 160, 220, is characterized by utilizing two hooked portions to support the tube-like lamp. Comparing to the conventional fasteners configured to directly wrap around the lamp, the fixing mechanism of the present invention significantly reduces the heat dissipated from the contact surface between the lamp and the fixing mechanism. Therefore, the phenomenon of low-temperature pink is not observed when a liquid crystal display using the backlight device of the present invention is placed in a low temperature environment (such as a 0 C. chamber) for conducting a long-time operation test. Furthermore, the fixing mechanism of the present invention is preferably made of materials having a low thermal conductivity, e.g., plastics such as engineering plastics or resin polymer such as PC resin or ABS resin, thereby more efficiently reducing the heat dissipated from the contact surface between the lamp and the fixing mechanism.
  • [0028]
    Although the invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6960002 *Jan 12, 2004Nov 1, 2005Au Optronics Corp.Direct backlight module
US7059736 *Sep 4, 2003Jun 13, 2006Au Optronics Corp.Backlight module
US7101069Jul 2, 2003Sep 5, 2006Au Optronics Corp.Direct backlight module
US7258462 *Apr 22, 2005Aug 21, 2007Matsushita Electric Industrial Co., Ltd.Backlight unit including curved fluorescent lamp, and liquid crystal display apparatus including the backlight unit
US7273295 *Feb 7, 2006Sep 25, 2007Au Optronics Corp.Lighting module and backlight module
US7309143 *Dec 15, 2004Dec 18, 2007Sharp Kabushiki KaishaOptical material, optical element, illuminator and display device
US7419278 *Sep 8, 2006Sep 2, 2008Lg. Display Co., LtdLamp guide holder, backlight assembly and liquid crystal display module including the same
US7461963 *Jan 12, 2005Dec 9, 2008Sharp Kabushiki KaishaDisplay device lighting unit
US7490972 *Aug 25, 2006Feb 17, 2009Mitsubishi Electric CorporationSurface light source apparatus
US7510317 *Jun 1, 2005Mar 31, 2009Sharp Kabushiki KaishaIlluminating device for display device
US7524100 *Jun 29, 2006Apr 28, 2009Lg. Display Co., Ltd.Light and liquid crystal display device having the same
US7674007Aug 14, 2008Mar 9, 2010Samsung Electronics Co., Ltd.Backlight assembly, liquid crystal display apparatus having the same and method of manufacturing lamp-fixing member
US7703964Apr 23, 2007Apr 27, 2010Sharp Kabushiki KaishaIllumination device and display apparatus including the same
US8459828 *Jul 15, 2010Jun 11, 2013Samsung Display Co., Ltd.Backlight assembly and display device having the same
US8537306 *Dec 15, 2006Sep 17, 2013Lg Display Co., Ltd.Backlight assembly for liquid crystal display
US8622565 *Apr 27, 2009Jan 7, 2014Funai Electric Co., Ltd.Backlight device for liquid crystal module
US9046243Dec 5, 2013Jun 2, 2015Funai Electric Co., Ltd.Backlight module
US20040012763 *Jul 2, 2003Jan 22, 2004Au Optronics Corp.Direct backlight module
US20040257792 *Sep 4, 2003Dec 23, 2004Au Optronics Corp.Backlight module
US20050135118 *Dec 15, 2004Jun 23, 2005Sharp Kabushiki KaishaOptical material, optical element, illuminator and display device
US20050152124 *Jan 12, 2004Jul 14, 2005Yi-Shiun TsaiDirect backlight module
US20050207149 *Jan 12, 2005Sep 22, 2005Sharp Kabushiki KaishaDisplay device lighting unit
US20050243548 *Apr 22, 2005Nov 3, 2005Hirofumi YamashitaBacklight unit including curved fluorescent lamp, and liquid crystal display apparatus including the backlight unit
US20050243571 *Apr 12, 2005Nov 3, 2005Sang-Min KangBacklight assembly and display device having the same
US20050281037 *Jun 1, 2005Dec 22, 2005Sharp Kabushiki KaishaIlluminating device for display device
US20060039163 *Aug 17, 2005Feb 23, 2006Samsung Electronics Co., Ltd.Supporting member for a display device, backlight assembly having the same and display device having the same
US20060187665 *Feb 7, 2006Aug 24, 2006Au Optronics Corp.Lighting module and backlight module
US20070053171 *Sep 8, 2006Mar 8, 2007Lg Philips Lcd Co., Ltd.Lamp guide holder, backlight assembly and liquid crystal display module including the same
US20070053207 *Aug 25, 2006Mar 8, 2007Mitsubishi Electric CorporationSurface light source apparatus
US20070153510 *Jun 29, 2006Jul 5, 2007Lg Philips Lcd Co., Ltd.Light and liquid crystal display device having the same
US20070189006 *Apr 23, 2007Aug 16, 2007Sharp Kabushiki KaishaIllumination device and display apparatus including the same
US20080002096 *Dec 15, 2006Jan 3, 2008Sang Bum LeeBacklight assembly for liquid crystal display
US20080007937 *Jul 7, 2006Jan 10, 2008Hung-Yi Ou YangDirect-type backlight module
US20080019152 *Dec 1, 2005Jan 24, 2008Sharp Kabushiki KaishaLight-Source Holder, Illumination Device For Display Device, And Display Device
US20080303978 *Aug 14, 2008Dec 11, 2008Samsung Electronics Co., LtdBacklight assembly, liquid crystal display apparatus having the same and method of manufacturing lamp-fixing member
US20100002417 *Mar 11, 2009Jan 7, 2010Au Optronics Corp.Back bezel for use in a backlight module structure, the backlight module structure, and the method for manufacturing the back bezel
US20100046206 *Apr 27, 2009Feb 25, 2010Funai Electric Co., Ltd.Backlight device for liquid crystal module
US20100284171 *Jul 15, 2010Nov 11, 2010Samsung Electronics Co., Ltd.Backlight assembly and display device having the same
USRE43992Dec 7, 2010Feb 12, 2013Sharp Kabushiki KaishaLamp holding apparatus, backlight device for display device including same, display device including same and liquid crystal display device including backlight device for display device
USRE44197Dec 8, 2010May 7, 2013Sharp Kabushiki KaishaDisplay device lighting unit
Classifications
U.S. Classification362/390, 362/225, 362/223, 362/216
International ClassificationF21V29/15, F21V15/04, F21V19/00
Cooperative ClassificationG02F1/133604, F21V29/15, F21V19/0095, F21V15/04, G02F1/133608
European ClassificationF21V15/04, F21V19/00F2, F21V15/06
Legal Events
DateCodeEventDescription
Oct 4, 2002ASAssignment
Owner name: CHI MEI OPTOELECTRONICS CORP., TAIWAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TSAI, YI TE;LEE, HUNG CHING;KANG, CHOU YU;AND OTHERS;REEL/FRAME:013365/0822
Effective date: 20020903
Oct 22, 2007FPAYFee payment
Year of fee payment: 4
Oct 29, 2007REMIMaintenance fee reminder mailed
May 10, 2010ASAssignment
Owner name: CHIMEI INNOLUX CORPORATION,TAIWAN
Free format text: MERGER;ASSIGNOR:CHI MEI OPTOELECTRONICS CORP.;REEL/FRAME:024358/0143
Effective date: 20100318
Oct 20, 2011FPAYFee payment
Year of fee payment: 8
Apr 3, 2014ASAssignment
Owner name: INNOLUX CORPORATION, TAIWAN
Free format text: CHANGE OF NAME;ASSIGNOR:CHIMEI INNOLUX CORPORATION;REEL/FRAME:032604/0487
Effective date: 20121219
Oct 20, 2015FPAYFee payment
Year of fee payment: 12